Scholarly record

USING ACOUSTIC IMPEDANCE IN RESERVOIR CHARACTERIZATION

Ion Malureanu, Maria Stoicescu, Daniela-Doina Neagu, Laura Mariana Nistor

Abstract

Most of the wells have an associated survey suite designed for geophysical investigations, including neutron log, density log, and sonic log. These tools are used later on for singular, dual, or complex boreholes geophysical interpretation, especially for reservoir characterization in terms of lithology and porosity. It is known that the acoustic waveпїЅs velocity through different rock types is a function of the elastic properties and density of both the mineral skeleton of that rock, and the in situ fluids, stress, etc. The combination of the sonic and density logs is currently the method used for determining the porosity and lithology content of the reservoir. Acoustic impedance values can be computed using the travel time measured form the sonic log and the bulk density measured from the density log. The fact that many wells have recorded these two methods of investigation triggers the conclusion that we have sufficient data for this kind of interpretation. In this paper we analyze the dependency between the acoustic impedance and porosity, fluid saturation, and lithology. The end results allow us to say that acoustic impedance is a property very useful in hydrocarbon reservoir characterization.

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